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v = r' = (8t)i + (-4t)j
a = v' = 8i - 4j
2) r = 2t³i + (t² - 6)j
v = r' = 6t²i + 2tj --> saat t = 2 s --> v = 6.2² + 2.2
= 6.4 + 4
= 24 + 4
= 28 m/s
a = v' = 12ti + 2j --> saat t = 2 s --> a = 12.2 + 2
= 24 + 2
= 26 m/s²
semoga membantu ya :)